Improvement in blackboards



H. ZOLLINGER.

l BLACKBQAM.y Nb. 175,635. Patented Apr`114.1876.

'UNITED STATES- PATENT. OFrIoi:a

HENRY ZOLLINGER, OF HYDE PARK, MASSACHUSETTS.

IMPROVEMENT IN BLACKBOAR'DS.

Speoitcationform'ng part of Letters Patent No. 175,635, dated April 4, 1876; application tiled v october 20, 1875.

To all whom it may concern:

Be it known thatI, HENRY ZOLLINGER, of

Hyde Park, in the county of Norfolk an dSt-ate board while the frame is so fastened.

This is accomplished by two swinging arms as long as two-thirds ot' the heigh tof the frame, andas broad as the thickness of the blackboard and the frame, so as to lit closelyon either side ot' blackboard and fra-me, which are fastened to this frame and the blackboard by screws.'

The blackboard is shown in a side view in Figure 1, representing the same when it is turned round a quarter ot' a whole turn in the frame, at an angle offorty degrees, (400.) The framed is markedrA, the swinging arms B, the blackboard C, the screws fastening' the arms to the frame D, and those fastening the blackboard to the arms E. In order to turn it, the blackboard is seized at the upper or lower end, and drawn toward the person. By doing so the arms are'pulled away from the f ramc, a.nd the blackboard may be turned over. At the lower end ofthe swinging arms, on the side nearest the blackboard, brass strips are inserted in the arms, in which three or four slots, marked S, are cut, opening upward at an angle ot' about sixty degrees (60O)against the edge of the swinging arms. The screws E E are'lhung in the lower or higher slots, in order to lower or to raise the blackboard. At the top of the frame two blocks, IWF, are screwed on', in which the arms are fastened by screws. Toward the lower e'nd ol' the fra-me two other blocks, G Gr,- are nailed ou for the purpose of keeping the blackboard in position when matter is to be erased. At the lower edge otl the fra-me a shelf, H, is fastened to hold the chalk, and oneach side a metal basket, I I, to hold the sponge.

Fig. 2 shows the blackboard and frame in plan View, K K designating two ot' the four Ascrews by which the frame is fastened to the wall.

Fig.3 is a modification, showing the stop arranged outside of the arms B, and the screws sunk to take into the plate only.

I claim as my inventionl. The frame A A, pivoted armsB B, having slots S, and the blackboard G, combined to operate substantially as set forth.

2. The frame A A, provided with pivoted arms B B, having slots S, blocks G G, acting as stops, shelf H, and wiperbasket I I, com-A bined and arranged together substantially as and for the purpose described.

HENRY ZOLLINGER. Witnesses:

U. HoLzER, THEO. H. FUNCKE.' 

